Abstract

An external-cavity 1560-nm diode laser was frequency doubled in a 3-cm-long periodically poled LiNbO3 waveguide doubler with 120% W−1 conversion efficiency. The 780-nm light was used to detect the D2 transitions of Rb, and the laser frequency was locked to Doppler-broadened lines of Rb. Furthermore, the ~1 μW of second-harmonic power was sufficient for detecting the sub-Doppler lines of Rb, and the laser was locked to a 87Rb crossover line.

© 1996 Optical Society of America

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